bush presidential center in dallas. with all five living presidents on one stage, president obama said they are part of an exclusive club but one that bears an incredible responsibility. >> the truth is, our club's more like a support group. last time we all got together was just before i took office, and i needed that because as each of these leaders will tell you, no matter how much you may think you're ready to assume the office of the presidency, it's impossible to truly understand the nature of the job until it's yours. >> and no doubt the president is relying on some of that empathy today with all that lies urgently before him. with us now from the george w. bush presidential center in dallas, texas, is the host of msnbc's "hardball," my friend and colleague, chris matthews. and in los angeles, democratic strategist bob shrum, a columnist for the "daily beast." chris, former president clinton tweeted a remarkable photo of all five former presidents together today. and the president, himself, spoke about not being